http://sports.espn.go.com/espn/page2/story...er/050719&num=0
Since there are very few, if any, reliable studies available that demonstrate the percentage of winners -- and big winners -- from among the tens of millions who play the game, you are probably wondering how I "know" this. Well, as it turns out, there is one group that can -- and does -- track this kind of stat, though they are not about to publicize the results. That group consists of online poker site management, two members of which revealed to me at the WSOP that what intuition suggests must be true -- only 8 and 7 percent, respectively, of all players on their sites finish the year in the black. And I'm not talking about deep in the black, either. The vast majority of those winners are not about to give up their day jobs.
If you think about it for a moment, the percentages have to be even lower for people who play primarily at casinos, because then you have to subtract the cost of travel to and from, meals, lodging, dealers' tips -- not to mention those "profits" that somehow find their way into slot machines or those huge piles of chips blackjack dealers and roulette operators always have sitting in front of them.
-------------------------------------------------------
An interesting article overall I suggest you check it out if you like poker.
From a business point of view I would LOVE to know what kind of money those sites make. A successful poker site must make some serious bank. Tough comeptition to get noticed I am sure, but man the rewards must be nice. tough for all of us stateside cause I wouldn't touch running one with a 120 foot pole. I'd be more worried about prosecution from that than any porn site I would ever run.